Fix test_zone map origin

Origin in the map didn't quite match origin in Gazebo

Author: nickswalker

fetch_gazebo_demo/maps/test_zone.yaml

@@ -1,6 +1,6 @@
 image: test_zone.pgm
 resolution: 0.050000
-origin: [-10.929414, -10.830637, 0.000000]
+origin: [-10.50, -10.830637, 0.000000]
 negate: 0
 occupied_thresh: 0.65
 free_thresh: 0.196